Spatiotemporal retrieval of the aerosol optical thickness using Landsat 8 OLI imagery for Indian urban area

IF 2.9 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Akshay Chauhan, Namrata Jariwala, Robin Christian
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Abstract

The surge in urbanization and industrialization is majorly contributing to ambient air pollution, predominantly in terms of particulate emissions. Human health is highly susceptible to the particles suspended in the air due to their lightweight and small size (≤ 2.5 μm), called atmospheric aerosols. In India, insufficient ground-based instruments hinder continuous aerosol monitoring. However, remote sensing offers earth imagery for in-depth analysis of air quality and weather parameters. In the present study, an attempt is made to retrieve the high-resolution (30 m) AOT using Landsat 8 Operational Land Imager (L8-OLI) imagery for Pune, Maharashtra, from the years 2014 to 2021. For the atmospheric corrections and better spatiotemporal resolution, the dark target spectrum-based Image Corrections for Atmospheric Effects (iCOR) algorithm was executed. The year 2021 showed the highest mean AOT value at the Pashan location (18.537° N, 73.805° E) in Pune, India. Also, seasonal analysis (winter and summer) indicates that the mean AOT in the winter gradually increases every year. The AOT retrieved using L8-OLI with iCOR and AOT retrieved from Aerosol Robotic Network (AERONET) in situ monitoring station (± 30 min) at 440 nm showed R2 = 0.76, r = 0.83, and RMSE = 0.1012. From this, it is summarized that for L8-OLI images, the iCOR algorithm performs well for the atmospheric correction by retrieving AOT at high spatial resolution with minimum cloud cover.

Abstract Image

利用 Landsat 8 OLI 影像对印度城市地区的气溶胶光学厚度进行时空检索
城市化和工业化的迅猛发展是造成环境空气污染的主要原因,其中主要是颗粒物排放。悬浮在空气中的颗粒重量轻、体积小(≤ 2.5 μm),被称为大气气溶胶,极易对人体健康造成影响。在印度,地面仪器的不足阻碍了对气溶胶的持续监测。不过,遥感技术可提供地球图像,用于深入分析空气质量和天气参数。在本研究中,尝试使用 Landsat 8 Operational Land Imager(L8-OLI)图像检索马哈拉施特拉邦普纳 2014 年至 2021 年的高分辨率(30 米)AOT。为了进行大气校正和提高时空分辨率,执行了基于暗目标光谱的大气效应图像校正(iCOR)算法。2021 年,印度浦那 Pashan 地点(北纬 18.537°,东经 73.805°)的平均 AOT 值最高。此外,季节分析(冬季和夏季)表明,冬季的平均 AOT 值逐年增加。使用 L8-OLI 和 iCOR 提取的 AOT 与气溶胶机器人网络(AERONET)原位监测站(± 30 分钟)在 440 纳米波长处提取的 AOT 显示 R2 = 0.76,r = 0.83,RMSE = 0.1012。由此可以总结出,对于 L8-OLI 图像,iCOR 算法通过检索高空间分辨率的 AOT 和最小云量,在大气校正方面表现出色。
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来源期刊
Air Quality Atmosphere and Health
Air Quality Atmosphere and Health ENVIRONMENTAL SCIENCES-
CiteScore
8.80
自引率
2.00%
发文量
146
审稿时长
>12 weeks
期刊介绍: Air Quality, Atmosphere, and Health is a multidisciplinary journal which, by its very name, illustrates the broad range of work it publishes and which focuses on atmospheric consequences of human activities and their implications for human and ecological health. It offers research papers, critical literature reviews and commentaries, as well as special issues devoted to topical subjects or themes. International in scope, the journal presents papers that inform and stimulate a global readership, as the topic addressed are global in their import. Consequently, we do not encourage submission of papers involving local data that relate to local problems. Unless they demonstrate wide applicability, these are better submitted to national or regional journals. Air Quality, Atmosphere & Health addresses such topics as acid precipitation; airborne particulate matter; air quality monitoring and management; exposure assessment; risk assessment; indoor air quality; atmospheric chemistry; atmospheric modeling and prediction; air pollution climatology; climate change and air quality; air pollution measurement; atmospheric impact assessment; forest-fire emissions; atmospheric science; greenhouse gases; health and ecological effects; clean air technology; regional and global change and satellite measurements. This journal benefits a diverse audience of researchers, public health officials and policy makers addressing problems that call for solutions based in evidence from atmospheric and exposure assessment scientists, epidemiologists, and risk assessors. Publication in the journal affords the opportunity to reach beyond defined disciplinary niches to this broader readership.
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